Strict mode: helpers inside attribute concats are not auto-invoked

[chancancode]

{{!-- works in standalone hbs --}}
<div class="it {{works}}" />

{{!-- does not work in gjs, calls Function.prototype.toString instead --}}
function works() {
  return "works";
}

<template>
  <div class="it {{works}}" />
</template>

Strict mode RFC only intended the change for arguments, not attributes: https://github.com/emberjs/rfcs/blob/508ac9b95bf2a4b397bf72b8e51d981c14c42535/text/0496-handlebars-strict-mode.md#3-no-implicit-invocation-of-argument-less-helpers

[patricklx]

mmm, and what about
{{(works)}}?

[chancancode]

Yep it does, but it is a bug that it is necessary; also makes codemods (or just manual migration) etc harder when there are inconsistencies like these

[kategengler]

Reproduction here https://share.glimdown.com/v5IaYaF4Ttmsngzuntoaqg

[NullVoxPopuli]

This might not need an RFC (or update to the RFC), but I think this might need an RFC because making this work in strict mode sort of aligns with another related feature that I want which I've been wanting, called "value collapsing", where the renderer knows when a value is desired (such as in the string-concat syntax position, or in a plain {{ }} somewhere in the DOM), where we keep evaluating managers until we get a renderable value back -- this would enable helper-modifier -> helper-modifier -> value (aka wrapped resources or resource-backed modifiers), as well as function-based components, if people wanted to experiment with those without extra lets